During August 2025, kallisti5 enhanced the tree-sitter/tree-sitter repository by implementing Haiku OS endianness support, focusing on cross-platform development and system programming in C. They introduced Haiku OS detection within endian.h, ensuring that endianness was handled correctly across Haiku environments and aligning its behavior with other Unix-like systems. This work improved the reliability of endian-dependent parsing paths in the C parser, reducing platform-specific edge cases and increasing overall robustness. By documenting the Haiku-specific changes and laying the groundwork for future platform validation, kallisti5 delivered a focused, technically sound feature that deepened tree-sitter’s cross-platform compatibility without addressing bug fixes.